You're an agnostic until you state that you believe there is no God.
I do believe there is no god, because I haven't seen any evidence. I also don't believe that there are invisible aliens that live in my house from another galaxy. I can't be absolutely positive that there aren't invisible aliens living in my house, but I haven't experienced any evidence, so I don't believe they are there.
I don't believe in god. I believe there is no god. However, I wouldn't absolutely rule out that god exists, and I wouldn't say that it's necessarily impossible to empirically experience god.